require 'rubygems'
require 'rubygems/dependency'
require 'rubygems/dependency_resolver'
require 'rubygems/dependency_list'
require 'rubygems/installer'
require 'tsort'
module Gem
class RequestSet
include TSort
def initialize(*deps)
@dependencies = deps
yield self if block_given?
end
attr_reader :dependencies
# Declare that a gem of name +name+ with +reqs+ requirements
# is needed.
#
def gem(name, *reqs)
@dependencies << Gem::Dependency.new(name, reqs)
end
# Add +deps+ Gem::Depedency objects to the set.
#
def import(deps)
@dependencies += deps
end
# Resolve the requested dependencies and return an Array of
# Specification objects to be activated.
#
def resolve(set=nil)
r = Gem::DependencyResolver.new(@dependencies, set)
@requests = r.resolve
end
# Resolve the requested dependencies against the gems
# available via Gem.path and return an Array of Specification
# objects to be activated.
#
def resolve_current
resolve DependencyResolver::CurrentSet.new
end
# Load a dependency management file.
#
def load_gemdeps(path)
gf = GemDepedencyAPI.new(self, path)
gf.load
end
def specs
@specs ||= @requests.map { |r| r.full_spec }
end
def tsort_each_node(&block)
@requests.each(&block)
end
def tsort_each_child(node)
node.spec.dependencies.each do |dep|
next if dep.type == :development
match = @requests.find { |r| dep.match? r.spec.name, r.spec.version }
if match
begin
yield match
rescue TSort::Cyclic
end
else
raise Gem::DependencyError, "Unresolved depedency found during sorting - #{dep}"
end
end
end
def sorted_requests
@sorted ||= strongly_connected_components.flatten
end
def specs_in(dir)
Dir["#{dir}/specifications/*.gemspec"].map do |g|
Gem::Specification.load g
end
end
def install_into(dir, force=true, &b)
existing = force ? [] : specs_in(dir)
dir = File.expand_path dir
installed = []
sorted_requests.each do |req|
if existing.find { |s| s.full_name == req.spec.full_name }
b.call req, nil if b
next
end
path = req.download(dir)
inst = Gem::Installer.new path, :install_dir => dir,
:only_install_dir => true
b.call req, inst if b
inst.install
installed << req
end
installed
end
def install(options, &b)
if dir = options[:install_dir]
return install_into(dir, false, &b)
end
cache_dir = options[:cache_dir] || Gem.dir
specs = []
sorted_requests.each do |req|
if req.installed?
b.call req, nil if b
next
end
path = req.download cache_dir
inst = Gem::Installer.new path, options
b.call req, inst if b
specs << inst.install
end
specs
end
# A semi-compatible DSL for Bundler's Gemfile format
#
class GemDepedencyAPI
def initialize(set, path)
@set = set
@path = path
end
def load
instance_eval File.read(@path).untaint, @path, 1
end
# DSL
def source(url)
end
def gem(name, *reqs)
# Ignore the opts for now.
reqs.pop if reqs.last.kind_of?(Hash)
@set.gem name, *reqs
end
def platform(what)
if what == :ruby
yield
end
end
alias_method :platforms, :platform
def group(*what)
end
end
end
end
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